Lew has been Treasury secretary since February 2013, moving to the job after serving as White House chief of staff.

He is one of President Obama's top Cabinet officials and has been involved in recent weeks in helping craft sanctions against Russia for its annexation of Crimea.

The prostate problem was an issue for Lew on an official trip to Mexico City last week. Lew received outpatient treatment at a hospital there Tuesday for what a Treasury spokesman described at the time as "a minor medical issue."

Lew was able to resume his schedule in Mexico City, the second leg of a trip that also took him to Brazil.